Question about Quantum Eraser

[Jenny A]

"Observation beings - matter behaves differently". Thats magic.

Nope, because observation of matter by beings means that the matter necessarily needs to interact with the matter the beings are made of. That it then behaves differently is not magic. The extent to which it behaves differently may be surprising, but not magic.

Quantum level physics is not something I really know anything about. But if my basic understanding is right, observing things at the quantum level changes things at the quantum because we observe things by watching things bounce off things. This isn't a problem if you are observing light bounce off an elephant or even a single cell observed through a microscope because light has little immediate effect on the object observed. But to "see" a subatomic thing you must bounce something close to its own mass off of it because there isn't anything smaller to throw at it. It's like if you could only see elephants by bouncing cars off of them or hitting them with fire hoses.

(Edit) Or if we could only see elephants by seeing the effects of elephants running into largish thins like six foot fences. Sort of like the way we see wind. But of course the wind is affected by moving other things around.

Is that roughly right? If not, please explain.